Hammer



FIG. 1 is a front elevational view of the hammer showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is an enlarged left side elevational view thereof;

FIG. 4 is an enlarged right side elevational view thereof;

FIG. 5 is a further enlarged top plan view thereof; and,

FIG. 6 is a further enlarged bottom plan view thereof. 

The ornamental design for a hammer, as shown and described. 